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Northern Colorado Water Conservancy District <br /> 220 Water Avenue• Berthoud,CO 80513 •970-532-7700•fax 970-532-0942 <br /> • MEMORANDUM <br /> TO: Mr. Mike Serlet, PE <br /> Colorado Water Conservation Board <br /> 1580 Logan Street, Suite 750 <br /> Denver, CO 80203 lk <br /> FROM: Jon Altenhofen, PE <br /> Supervisory Water Res rces Engineer <br /> Northern Colorado Water Conservancy District (NCWCD) <br /> 220 Water Ave., Berthoud, CO 80513; 970-622-2236;jltenhofen@ncwcd.org <br /> DATE: March 16, 2006 <br /> REF: Accounting for Sedgwick County Well Users, Inc. (SCWU)in Support of Request for <br /> Colorado Agricultural Drought Response Grant for 2005 <br /> NCWCD's Augmentation Recharge Accounting (ARA)Program provides accounting services <br /> to augmentation plans in the lower South Platte River in Colorado. As Water Resources <br /> Engineer responsible for the ARA Program, I completed all the accounting necessary for <br /> SCWU operations for Water Year 2005. This involved the use of groundwater models <br /> (SDFView) to compute the lagged well depletions and recharge accretions at the river. <br /> Information was gathered from meter records for the wells and Water Commissioner records <br /> were utilized to quantify recharge site inflows. <br /> • Monthly updates of the accounting for net effects on the river were submitted to the Division <br /> Engineer to verify that all out-of-priority well depletions were augmented from the SCWU <br /> replacement supplies consisting of both recharge accretions and pumping of augmentation <br /> wells directly back to the river. Inflows to groundwater recharge ponds result in accretions at <br /> the river later in time. Augmentation wells are pumped directly to the river through ditches <br /> and creeks on days of river call to replace the remaining depletions not covered by recharge <br /> accretions. The use of augmentation wells also causes depletions in the future that must be <br /> replaced if out-of-priority. <br /> The accounting completed for SCWU for the depletions of member wells is utilized by SCWU <br /> to assess their members at a$per acre-foot of depletions at the river. SCWU uses these <br /> collected water fees to lease the replacement supplies (i.e., recharge accretions and <br /> augmentation wells) developed by SCWU members and others. The attached Table 1 <br /> (recharge accretion leases for$54,651) and Table 2 (augmentation well leases for$30,469) are <br /> the accountings that list the leases of replacement supplies for 2005. Augmentation well <br /> credits are the amounts of pumped water delivered directly to the river minus the lagged <br /> groundwater depletions from prior pumping of the well for augmentation purposes. <br /> SCWU leases these replacement supplies during the period of April 1 through October 15. The <br /> $per acre-foot lease rates for 2005 for both recharge accretions and net augmentation well <br /> credits are$20 per acre-foot. <br /> • <br /> 1 <br />